EP0100181A1 - Coquille protège-orteils - Google Patents

Coquille protège-orteils Download PDF

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Publication number
EP0100181A1
EP0100181A1 EP83304046A EP83304046A EP0100181A1 EP 0100181 A1 EP0100181 A1 EP 0100181A1 EP 83304046 A EP83304046 A EP 83304046A EP 83304046 A EP83304046 A EP 83304046A EP 0100181 A1 EP0100181 A1 EP 0100181A1
Authority
EP
European Patent Office
Prior art keywords
fibres
cap
toe
domed member
toe cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83304046A
Other languages
German (de)
English (en)
Inventor
Terence James Brown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of EP0100181A1 publication Critical patent/EP0100181A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/08—Heel stiffeners; Toe stiffeners
    • A43B23/081—Toe stiffeners
    • A43B23/086—Toe stiffeners made of impregnated fabrics, plastics or the like
    • A43B23/087—Toe stiffeners made of impregnated fabrics, plastics or the like made of plastics

Definitions

  • This invention relates to protective toe-caps for use in safety shoes or boots which are intended to provide the wearer with protection against damage to the toes arising from accidental heavy impact on the toe portion of the shoe or boot.
  • a toe-cap has now been devised which is lighter and less expensive to manufacture than a metal toe-cap and is not subject to corrosion.
  • a protective toe-cap comprising a domed member adapted to lie over the toes of the wearer and having an open end to receive the toes, said domed member comprising a formable polymeric composition, optionally reinforced with randomly disposed fibres characterised in that the domed member is reinforced with uniaxially aligned continuous fibres bonded to the formable polymer of the dome member.
  • the toe-cap may be provided with a flange extending inwardly from at least part of the base of the domed member.
  • the formable polymeric composition used to fabricate the toe-cap may be any polymeric composition which is capable of being formed into the required shape in a mould.
  • it may be a thermoplastics composition which can be melted and injection moulded.
  • it may be a dough moulding thermosetting polymer composition which is introduced into the mould in an uncured fluid state and is cured in the mould.
  • thermoplastics composition which is incompletely polymerised when injected into a mould but is cured therein. The latter technique is termed "reaction injection moulding".
  • a preferred method of forming toe-caps from a formable polymer composition is by compression moulding of a blank or sheet of a thermoplastics polymer, preferably containing randomly disposed reinforcing fibres particularly continuous fibres. Sheets of material made by thermoplastic polymer melt impregnation of glass mats containing randomly disposed continuous fibres are particularly suitable.
  • the essential feature of the invention is the presence of the aligned, continuous reinforcing fibres.
  • Such fibres may be included in the toe-cap by a number of methods.
  • a first method required lengths of continuous fibres may be positioned and restrained in a mould prior to the introduction of the mouldable polymer composition.
  • the aligned fibre reinforcement will be in the required position providing the introduction of the curable composition has not displaced the continuous aligned fibres from the originally chosen position.
  • This method has the potential disadvantages that the continuous, aligned fibres will be displaced from their chosen position during introduction of the mouldable composition.
  • a more important disadvantage is that the fibres may not be adequately wetted when the mouldable polymer is introduced and the maximum benefit of the reinforcement may not be derived.
  • the continuous, aligned fibres are introduced in the form of preformed reinforced polymer strips which consist of continuous, aligned fibres embedded in a polymer matrix.
  • a suitable method of forming such a product is described in European patent publication No. 56703.
  • Such a strip can be prepared under conditions which ensure that the fibres are thoroughly wetted by the polymer to ensure that the reinforcement properties are maximised.
  • Strips reinforced with continuous fibres can be readily located in a mould, particularly in a process in which the strip is used in conjunction with a sheet containing randomly dispersed fibres in a compression moulding process to form the toe-cap.
  • the reinforcement may be provided by a single strip or a plurality of strips.
  • the continuous, aligned fibres whether used as untreated fibres or as a preformed strip are positioned in the mould so that their position in the finished toe-cap will give a required level of protection to the wearer.
  • the protection against impact provided by the toe-cap is assessed according to British Standard No. BS 953:1979 which gives levels of performance ranging from a 40 joule drop test up to a 200 joule drop test.
  • the quantity and placement of the continuous, aligned fibres in the domed member will depend on the level of performance required of the toe-cap.
  • the preferred disposition of the fibres is with the fibres lying uniaxially across the toe-cap since this disposition provides the most effective resistance to impact.
  • the continuous fibres should extend across the whole width of the toe-cap, that is from the base of the side wall on one side of the cap to the base of the side wall on the other side of the cap.
  • the fibres may also extend into the flange at the base of the toe-cap.
  • the toe-cap may be provided with continuous fibres aligned across the whole of the toe-cap but in general such a construction is expensive and is not necessary for providing adequate protection.
  • continuous fibres may, at least in part, be disposed along the length of the toe cap, that is lie in a direction along at least an upper part of the domed member from the open end towards the toe end.
  • woven, continuous, aligned fibre structures may be used for insertion into the mould and may be disposed so that none of the aligned fibre elements making up the woven structure is parallel to the edge of the open end of the toe-cap.
  • the reinforcement When the reinforcement is introduced as a preformed reinforced polymer strip such strips may be present in side-by-side relationship, indirectly superimposed relationship or as part of a structure woven from the strips.
  • the essential requirements of the continuous fibres used are that they should be continuous and should be substantially aligned in parallel manner.
  • continuous is meant that the fibres should be at least 20 mm long. Preferably the fibres should be at least 50 mm long.
  • the fibres may be of any material which will provide reinforcement, including inorganic fibres and synthetic polymer fibres. Particularly useful for increasing the flexural modulus of the toe-cap are glass fibres and carbon fibres. Although the latter give the better properties their present cost leaves glass fibres as the preferred fibrous reinforcement.
  • the preferred formable polymer compositions are based on thermoplastic polymers because of the versatility of such materials in being adaptable to a variety of forming processes.
  • the thermoplastic polymer used should have high flexural modulus for optimum performance.
  • Inexpensive polymers such as poly(ethylene terephthalate), nylons and polypropylene are suitable.
  • the compositions may contain additives to improve stiffness and toughness. Randomly disposed glass fibres are a particularly useful additive.
  • the polymer of the strip may be the same or different from the polymer of the formable polymer composition. Where the two materials differ in chemical nature they should nevertheless be compatible so that the preformed strip is strongly bonded to the remainder of the toe-cap after the fabrication process is completed. In general, it is preferred that the chemical nature of the polymers in the preformed strip and the remainder of the toe-cap are the same, although they may differ substantially in average molecular weight.
  • the toe-caps of the invention may be of substantially uniform thickness or may be of varying thickness, the dimensions and profile of the toe-cap being defined by the mould cavity in which the aligned continuous fibres are incorporated in the toe-cap.
  • a toe-cap male and female moulding tools may define a die cavity of varying thickness as illustrated in Figures 1 to 4 of the accompanying drawings wherein:
  • the toe-cap 10 has a generally curved shape for conforming to the toe part of a safety boot or shoe so that, in use, it will bridge the toes in front of and to the side of the toes.
  • the toe cap is in the form of a single continuous curve in three dimensions and is produced from a formable polymeric composition, optionally reinforced with randomly disposed fibres, and a reinforcement of uniaxially aligned continuous fibres bonded to the formable polymer as hereinbefore described.
  • the main area 12 of the toe-cap is of substantially uniform thickness but the front part 14 and the forward part of the sides 16 are of increased thickness relative to the main area 12 as will be seen from Figure 3. These thickened parts 14 and the forward part of the sides 16 taper into and merge smoothly with the main area 12 as shown in Figure 4 and taper further back to the edge area 18 at the open end of the toe-cap.
  • the sides 16 are also of increased thickness at the base of the toe-cap and taper upwardly therefrom into the main area 12 as is clearly illustrated in Figure 1.
  • a flange 20 extends inwardly around the toe-cap 10 around the base thereof. As illustrated, this flange 20 will provide additional stiffness to the toe-cap but it is not essential. It may be necessary however to provide at least a small inwardly extending edge to the base of the toe-cap for use in locating and securing the toe-cap in position in the safety boot or shoe.
  • the main area 12 of the toe-cap 10 may be of the order of 3.5 millimetres thickness tapering down to 2.5 millimetres at the edge area 18.
  • the thickened front part 14 may be of the order of 6 millimetres thickness whilst the sides 16 may be of the order of 4 millimetres thickness at their base tapering into the main area 12.
  • This gradual merging and tapering of the thickness around the front-end of the toe-cap helps to strengthen the whole of the toe-cap and thereby allows an acceptably thin main area 12 to be utilised. It is important to avoid excessive thickness in the main area 12 because this would adversely affect the appearance of the boot or shoe which, for commercial reasons, may well have to be styled into a fashion product to some extent as well as functioning as safety footwear.
  • the limited thickening and gradual taper of the front part of the toe-cap merely adds a requirement for a small increase in length and does not detract significantly from the appearance of the footwear.
  • a further feature which may be provided as an improvement in the appearance of the footwear, the ease of building the toe-cap into a boot or shoe, and the comfort of the wearer, is that the rear edge area 18 of the toe-cap may be provided with a lip tapered in thickness relative to the main area 12 to facilitate a smooth transition of the toe-cap with the remainder of the boot or shoe.
  • the decreased thickness in this lip extending beyond edge area 18 does not significantly affect the strength of the toe-cap as a whole.
  • This lip will normally comprise a material which does not include significant amounts of uniaxially disposed fibres.
  • Samples of a glass mat reinforced polypropylene sheet (supplied as 'Symalit' GM40PP, containing 40% by weight of glass fibres) having a thickness of 3 mm were cut into blanks having dimensions 13 cm x 7 cm.
  • the polypropylene used had a low molecular weight, exhibiting a melt viscosity of 5 Ns/m 2 at 260°C.
  • Both the reinforced sheet and the reinforced pultrusions were placed in an infra-red preheat oven, maintained at 300°C, for 1 minute.
  • a toe-cap was moulded from the heat softened components using a toe-cap mould comprising male and female moulding tools defining a cavity of uniform thickness.
  • the male and female components of the toe-cap mould were bolted to opposite platens of a press to provide mating engagement when the press was closed.
  • the press platens were maintained at 70°C.
  • Two pultruded strips were removed from the oven and located in superimposed relationship in the male tool of a toe-cap mould so that in the finished moulding they would be located around that part of the toe-cap defining the open end of the toe-cap.
  • the sample of sheet was placed in the female tool of the mould.
  • the press was closed to give a pressure of 30 kg/cm 2 of platen and was maintained for 1 minute.
  • the operation produced a smooth surfaced toe-cap with the pultrusion strips embedded in the toe-cap.
  • the conditions of temperature and pressures used should be sufficient to unite the uniaxially reinforced member with the randomly reinforced member.
  • Example 1 The procedure of Example 1 was repeated except in that the toe-cap was formed from a glass mat reinforced polypropylene sheet containing 50% by weight of glass fibres (supplied as 'Symalit' GM50PP). The same pultrusion was used as in Example 1 and all other conditions remained the same.

Landscapes

  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP83304046A 1982-07-28 1983-07-12 Coquille protège-orteils Withdrawn EP0100181A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221755 1982-07-28
GB8221755 1982-07-28

Publications (1)

Publication Number Publication Date
EP0100181A1 true EP0100181A1 (fr) 1984-02-08

Family

ID=10531949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304046A Withdrawn EP0100181A1 (fr) 1982-07-28 1983-07-12 Coquille protège-orteils

Country Status (5)

Country Link
EP (1) EP0100181A1 (fr)
AU (1) AU1730783A (fr)
ES (1) ES8406179A1 (fr)
GB (1) GB2127275A (fr)
ZA (1) ZA835339B (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219633A1 (fr) * 1985-08-22 1987-04-29 Bayer Ag Embout de chaussure en matière thermoplastique moulé par injection
EP0239313A2 (fr) * 1986-03-25 1987-09-30 Haskon Corporation Bout dur pour chaussures
GB2188531A (en) * 1986-03-17 1987-10-07 John Alan Drew Shoe
EP0507322A2 (fr) * 1991-04-03 1992-10-07 Ykk Corporation Matériau de montage en feuille et bout pour chaussures de sécurité
EP0528249A1 (fr) * 1991-08-08 1993-02-24 Ykk Corporation Procédé de fabrication d'embout rigide pour chaussures de sécurité
US5210963A (en) * 1991-11-26 1993-05-18 Harwood John M Molded plastic toe cap
FR2693087A1 (fr) * 1992-07-02 1994-01-07 Yoshida Kogyo Kk Renfort de bout de chaussure et chaussure de sécurité munie d'un tel renfort.
EP0614623A1 (fr) * 1993-02-26 1994-09-14 Ykk Corporation Bouts durs pour chaussures de sécurité
FR2740149A1 (fr) * 1995-10-20 1997-04-25 Ykk Corp Procede de production d'un materiau de moulage en feuille, materiau de moulage en feuille renforce par des fibres ainsi produit et coquille de protection des orteils pour chaussure de securite realisee avec ce materiau
US5666745A (en) * 1995-11-06 1997-09-16 Harwood; John M. Molded plastic toe cap for shoes
US5809666A (en) * 1995-11-06 1998-09-22 Harwood; John M. Molded plastic toe cap for shoes
US6159589A (en) * 1995-12-22 2000-12-12 H.H. Brown Shoe Company Injection molding of long fiber reinforced thermoplastics
DE10114560A1 (de) * 2001-03-24 2002-09-26 Uvex Arbeitsschutz Gmbh Schutzschuh, Sicherheitsschuh bzw. -stiefel
US6907681B2 (en) * 2002-07-11 2005-06-21 Ykk Corporation Resin safety shoe toe cap
US7062868B2 (en) * 2001-10-29 2006-06-20 Esjotech S.R.L. Protective toecap, particularly for safety shoes
US7552548B2 (en) 2005-09-28 2009-06-30 Ykk Corporation Resin safety shoe toe cap

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986004490A1 (fr) * 1985-02-08 1986-08-14 Siskind Leland B M Protege-orteils pour chaussures et chaussures pourvues d'un tel protege-orteils
US4862606A (en) * 1986-02-20 1989-09-05 Siskind Leland B M Toe guard for footwear, process for its manufacture, and footwear so made
AU607634B2 (en) * 1988-09-16 1991-03-07 Pacific Dunlop Limited Safety footwear
US5074060A (en) * 1990-03-30 1991-12-24 Brncick Michael D Athletic shoe toe protector
CA2119837C (fr) * 1994-03-24 1998-09-22 Gilles Fortin Protecteur metatarsien pour chaussure de securite

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911436A1 (de) * 1968-03-12 1969-11-06 Semperit Gummiwerke Gmbh Deuts Fussschutz
AT305085B (de) * 1965-03-24 1973-02-12 Herbert Resner Ing Schuh oder Stiefel mit Versteifungen
US3829351A (en) * 1972-09-28 1974-08-13 Beckwith Corp Stiffening material for shoe parts
US3918182A (en) * 1972-03-20 1975-11-11 Terrell Corp Shoe reinforcing method and material
DE2549498A1 (de) * 1975-11-05 1977-05-12 Phoenix Gummiwerke Ag Unfallverhuetungsstiefel
EP0021612A1 (fr) * 1979-06-08 1981-01-07 Firth Cleveland Engineering Limited Coquille de protection des orteils
GB2050144A (en) * 1979-06-09 1981-01-07 Lsb Orthopaedics Ltd Reinforced toe caps

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT283955B (de) * 1966-05-18 1970-08-25 Semperit Ag Gummischuh und Verfahren zu dessen Herstellung
GB1291821A (en) * 1966-09-20 1972-10-04 Aerojet General Co Armour for providing protection against high energy particles
GB1282484A (en) * 1969-06-25 1972-07-19 Secr Defence Improvements in the manufacture of composite articles comprising carbon fibre
GB2071989B (en) * 1980-03-21 1984-11-28 Britton Ltd G B Protective toe caps for footwear
ATE179358T1 (de) * 1981-01-21 1999-05-15 Kawasaki Chem Holding Granulat aus faserverstärkten verbundstoffen und deren herstellungsverfahren

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT305085B (de) * 1965-03-24 1973-02-12 Herbert Resner Ing Schuh oder Stiefel mit Versteifungen
DE1911436A1 (de) * 1968-03-12 1969-11-06 Semperit Gummiwerke Gmbh Deuts Fussschutz
US3918182A (en) * 1972-03-20 1975-11-11 Terrell Corp Shoe reinforcing method and material
US3829351A (en) * 1972-09-28 1974-08-13 Beckwith Corp Stiffening material for shoe parts
DE2549498A1 (de) * 1975-11-05 1977-05-12 Phoenix Gummiwerke Ag Unfallverhuetungsstiefel
EP0021612A1 (fr) * 1979-06-08 1981-01-07 Firth Cleveland Engineering Limited Coquille de protection des orteils
GB2050144A (en) * 1979-06-09 1981-01-07 Lsb Orthopaedics Ltd Reinforced toe caps

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219633A1 (fr) * 1985-08-22 1987-04-29 Bayer Ag Embout de chaussure en matière thermoplastique moulé par injection
GB2188531A (en) * 1986-03-17 1987-10-07 John Alan Drew Shoe
GB2188531B (en) * 1986-03-17 1989-11-15 John Alan Drew Shoe
EP0239313A2 (fr) * 1986-03-25 1987-09-30 Haskon Corporation Bout dur pour chaussures
EP0239313A3 (en) * 1986-03-25 1988-09-21 Haskon Corp A protective toe cap for footwear
EP0507322A2 (fr) * 1991-04-03 1992-10-07 Ykk Corporation Matériau de montage en feuille et bout pour chaussures de sécurité
EP0507322A3 (en) * 1991-04-03 1993-01-20 Yoshida Kogyo K.K. Molding sheet material and toe puff for safety shoe
US5667857A (en) * 1991-04-03 1997-09-16 Nitto Boseki Co., Ltd. Toe puff for safety shoe
US5560985A (en) * 1991-04-03 1996-10-01 Nitto Boseki Co., Ltd. Molding sheet material and toe puff for safety shoe
EP0528249A1 (fr) * 1991-08-08 1993-02-24 Ykk Corporation Procédé de fabrication d'embout rigide pour chaussures de sécurité
US5331751A (en) * 1991-11-26 1994-07-26 Harwood John M Molded plastic toe cap
US5210963A (en) * 1991-11-26 1993-05-18 Harwood John M Molded plastic toe cap
WO1993010682A1 (fr) * 1991-11-26 1993-06-10 Harwood John M Embout renforce de soulier en plastique moule
FR2693087A1 (fr) * 1992-07-02 1994-01-07 Yoshida Kogyo Kk Renfort de bout de chaussure et chaussure de sécurité munie d'un tel renfort.
DE4320312A1 (de) * 1992-07-02 1994-01-13 Yoshida Kogyo Kk Kappensteife und Sicherheitsschuh
EP0614623A1 (fr) * 1993-02-26 1994-09-14 Ykk Corporation Bouts durs pour chaussures de sécurité
FR2740149A1 (fr) * 1995-10-20 1997-04-25 Ykk Corp Procede de production d'un materiau de moulage en feuille, materiau de moulage en feuille renforce par des fibres ainsi produit et coquille de protection des orteils pour chaussure de securite realisee avec ce materiau
US5666745A (en) * 1995-11-06 1997-09-16 Harwood; John M. Molded plastic toe cap for shoes
US5809666A (en) * 1995-11-06 1998-09-22 Harwood; John M. Molded plastic toe cap for shoes
US6159589A (en) * 1995-12-22 2000-12-12 H.H. Brown Shoe Company Injection molding of long fiber reinforced thermoplastics
DE10114560A1 (de) * 2001-03-24 2002-09-26 Uvex Arbeitsschutz Gmbh Schutzschuh, Sicherheitsschuh bzw. -stiefel
US7062868B2 (en) * 2001-10-29 2006-06-20 Esjotech S.R.L. Protective toecap, particularly for safety shoes
US6907681B2 (en) * 2002-07-11 2005-06-21 Ykk Corporation Resin safety shoe toe cap
US7552548B2 (en) 2005-09-28 2009-06-30 Ykk Corporation Resin safety shoe toe cap

Also Published As

Publication number Publication date
AU1730783A (en) 1984-02-02
ES524500A0 (es) 1984-08-01
GB8318937D0 (en) 1983-08-17
ZA835339B (en) 1984-06-27
ES8406179A1 (es) 1984-08-01
GB2127275A (en) 1984-04-11

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19840613

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Effective date: 19850629

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Inventor name: BROWN, TERENCE JAMES